Fan seat and method for producing it

Abstract

A fan seat ( 30, 30 ′) includes a basis ( 31 ) with a vertical extending tubal portion ( 32 ) having a pair of flanges ( 33 ) integrally formed on opposite ends of an inner circumferential surface thereof, and a bearing set ( 34, 34 ′) located in the tubal portion and sandwiched between the flanges. The bearing set includes a tube ( 36 ) and a pair of bearings ( 38 ) firmly secured in opposite ends of the tube. A method for producing the fan seat includes the following steps: providing a mold ( 50 ) with a cavity ( 53 ), locating the bearing set in the cavity with a space ( 60 ) formed between the bearing set and the mold corresponding to the tubal portion, injecting molten material into the space, and cooling the molten material whereby the molten material congeals into the tubal portion and integrates with the tube.

1. A method for producing a fan seat having a tubal portion in which a bearing set is installed, the method comprising steps of:
 providing a mold with a cavity; locating the bearing set in the cavity with a space formed between the bearing set and the mold corresponding to the tubal portion; 
 injecting molten material into the space; and 
 cooling the molten material, whereby the molten material congeals into the tubal portion and integrates with the bearing set. 
 
   
   
     2. The method as claimed in  claim 1 , wherein the tubal portion comprises a pair of flanges integrally formed on opposite ends of an inner circumferential surface thereof and the bearing set is sandwiched between the flanges. 
   
   
     3. The method as claimed in  claim 2 , wherein the bearing set comprises a tube and a pair of bearings secured in opposite end portions of the tube before the bearing set is located in the cavity. 
   
   
     4. The method as claimed in  claim 3 , wherein the tube and the bearing are made of different material. 
   
   
     5. The method as claimed in  claim 4 , wherein the bearings are made of nano ceramic material and the tube is made of metal. 
   
   
     6. The method as claimed in  claim 5 , wherein the tube comprises a shoulder formed in an inner circumferential surface thereof for spacing the bearings. 
   
   
     7. The method as claimed in  claim 2 , wherein the bearing set comprises a pair of bearings and a spacing column located between the bearings, the bearings and the spacing column being made of different material. 
   
   
     8. The method as claimed in  claim 2 , wherein the mold comprises an upper part and a lower part, a post extending from one of the upper and lower parts for locating the bearing set in the cavity of the mold. 
   
   
     9. The method as claimed in  claim 8 , wherein said one of the upper and lower parts comprises a stand adjacent the post, and an outer diameter of the stand is smaller than an outer diameter of the tubal portion so that one of the flanges can be formed at one end of the tubal portion. 
   
   
     10. The method as claimed in  claim 9 , wherein a block extends from the other one of the upper and lower parts and contacts a distal end of the post in the step of injecting molten material into the space, and an outer diameter of the block is smaller than an outer diameter of the tubal portion so that the other one of the flanges can be formed at an opposite end of the tubal portion. 
   
   
     11. A fan seat comprising:
 a basis comprising a tubal portion having a pair of flanges with an inner diameter smaller than the tubal portion integrally formed on opposite ends of an inner circumferential surface thereof; and 
 a bearing set located in the tubal portion and sandwiched between the flanges, 
 wherein the bearing set comprises a tube and a bearing installed in the tube, the tube and the bearing being made of different material; and 
 wherein the tube is made of metal material and the bearing is made of ceramic material. 
 
   
   
     12. The fan seat as claimed in  claim 11 , wherein the bearing is made of nano ceramic material. 
   
   
     13. The fan seat as claimed in  claim 12 , wherein the bearing is sleeve bearing. 
   
   
     14. The fan seat as claimed in  claim 12 , further comprising another bearing firmly secured in the tube spacing from said the bearing. 
   
   
     15. A fan seat comprising:
 a basis comprising a tubal portion having a pair of flanges with an inner diameter smaller than the tubal portion integrally formed art opposite ends of an inner circumferential surface thereof; and 
 a bearing set located in the tubal portion and sandwiched between the flanges, 
 wherein the bearing set comprises a pair of bearings and a spacing column located between the bearings, the bearings and the spacing column being made of different material; and 
 wherein the bearings are made of nano ceramic material, and the spacing column is a metal oil-bearing.